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1. [Amps] 813 dissp (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 15 Nov 2002 09:16:34 +0200; Actually, the 125W rating for 813 is for ICAS condition, while the 125W for the 4-125 is for the CCS condition. The 813 CCS rated anode power is 100W. 73, Traian; /archives//html/Amps/2002-11/msg00235.html (8,917 bytes)
2. [Amps] How light can you make a 500W amplifier? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 16 Oct 2002 12:09:35 +0200; The E class 7MHz CW only amplifier article was published in the May 1997 QST. Two versions were described in the first part, a 300W (IRFP440) and 500W out (IRFP450). The second part described a linea; /archives//html/Amps/2002-10/msg00165.html (13,239 bytes)
3. [Amps] 4-400A Anode Voltage??? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Tue, 22 Oct 2002 14:04:25 +0200; Very few peoples noted this characteristic regarding the IMD to output power dependence. For tetrodes, the IMD versus output power graph have a more complicate, non linear dependence (sometimes like; /archives//html/Amps/2002-10/msg00230.html (8,925 bytes)
4. [Amps] Regulated HV? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 30 Oct 2002 17:54:41 +0200; Hi all, I may be wrong (and please correct me if), but: For the dependence of the anode current (variation) in respect with the anode and grid voltages for a good SSB tetrode (see data sheet), you wi; /archives//html/Amps/2002-10/msg00319.html (10,976 bytes)
5. [Amps] 2 x 4cx1500b Tube matching? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Tue, 16 Jul 2002 09:26:33 +0300; Hello Greg Even if the the cathode and filament are connected, you may still use cathode R for negative feedback and "equalising" the tube currents, but you have to use chokes for the filaments. Ther; /archives//html/Amps/2002-07/msg00213.html (10,909 bytes)
6. [Amps] Fw: True dissipation rating of GU-74B/4CX800A? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 06 Jun 2002 09:17:45 +0300; The original GU74 data sheet stated 600Wanode diss but the cooling requirement graph was extended to 800W. For the russian tubes do not exist military and commercially purpose data or tubes, as the p; /archives//html/Amps/2002-06/msg00036.html (10,812 bytes)
7. [Amps] Solid State bias adjust? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Mon, 10 Jun 2002 17:54:03 +0300; The Ten Tec 444 have two separate bias circuits, one for each of the two power modules (pairs of MRF428's). If separate heatsinks are used, then separate bias (including thermal compensating sensor/d; /archives//html/Amps/2002-06/msg00064.html (7,365 bytes)
8. [Amps] 4CX800/GU74B Socket (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 14 Jun 2002 15:29:43 +0300; Hello Glenn I have somewhere inside my boxes a socket like yours, it have three or four capacitors, but are of the high voltage ceramic "chip" type ones (multilayer), without terminals, with their pa; /archives//html/Amps/2002-06/msg00089.html (9,209 bytes)
9. [Amps] HARRIS RF110 (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 10 May 2002 12:19:26 +0300; I have two RF-110A for restoration now, one is almost ready. Due to unknown conditions of the output tuned circuits, I got them out for check. One have a overheated coil (the wire coating color is da; /archives//html/Amps/2002-05/msg00113.html (8,810 bytes)
10. [Amps] Re: PUT your price on your forsale WAS FS:cheaptubesGU74B,GI7B,GS9B,GS23B (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Mon, 13 May 2002 08:51:29 +0300; In a previous discussion I wrote about the following possible problem. Before using the GI7 and similar tubes to full output, check how the anode cooler sit on the flat anode tube surface. I have a G; /archives//html/Amps/2002-05/msg00150.html (11,306 bytes)
11. [Amps] 3-500Z problem (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Mon, 13 May 2002 09:14:41 +0300; Hi amp fellows, I have NIB 3-500Z Eimac tube, manufacturing date seems to be 9640, as written on the envelope. The anode and the cathode/grid cylindrical assemblies are not perfectly coaxial. Looking; /archives//html/Amps/2002-05/msg00151.html (7,210 bytes)
12. [Amps] 3-500Z problem (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Mon, 13 May 2002 17:46:37 +0300; Hello Ron, Thank you for answer. I know about this way of "repairing" such tubes, but it works better for the graphite anode ones, because of their higher anode mass/weight. I tried myself for a RE40; /archives//html/Amps/2002-05/msg00171.html (9,010 bytes)
13. [Amps] QST article (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 17 May 2002 09:07:09 +0300; Hi all, Time ago, someone asked info about input Z for GG triode stage (maybe someone from G, I don't remember exactly). I made promise to look for an QST article named "Inside GG linear amplifier" b; /archives//html/Amps/2002-05/msg00264.html (6,288 bytes)
14. [Amps] Gu43b (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Mon, 04 Mar 2002 17:14:46 +0200; Hello Ken, 73's from Bucharest, Traian, YO9FZS/p; /archives//html/Amps/2002-03/msg00046.html (6,480 bytes)
15. [Amps] 10 Meters (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 14 Mar 2002 17:37:04 +0200; Not need for them to wake up. They already did! I read (RSGB RadCom magazine) that the car manufacturers are already thinking about implementing a higher DC voltage car system standard in the near fu; /archives//html/Amps/2002-03/msg00308.html (9,192 bytes)
16. [AMPS] Re: Tubes with high transfer capacitance..Hrrrm?? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Fri, 15 Feb 2002 09:20:35 +0200; If it is a triode, it often hapens in these russian data sheets. Look also at the data for the more popular GI6 and GI7 UHF triodes. The capacitances are measured and stated in the data sheet as for; /archives//html/Amps/2002-02/msg00146.html (8,296 bytes)
17. [Amps] Tube socket fitting SK510 - QB5/1750 (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Wed, 27 Feb 2002 17:55:44 +0200; Hello Peter, Nice to hear from you. The diameter difference is to 0.05 mm for a 9.5 mm diameter pin, and when considering also the socket contact manufacturing precision and tolerance, it may be not; /archives//html/Amps/2002-02/msg00303.html (8,088 bytes)
18. [AMPS] Blocking Capacitors (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Sun, 06 Jan 2002 16:14:29 +0200; Hello Phil This is a ceramic (disc with nut/screw contacts?) high voltage capacitor. "1278" is probably the date of manufacture (dec 1978) "K15" is the type of the capacitor (ceramic high voltage, as; /archives//html/Amps/2002-01/msg00066.html (8,740 bytes)
19. [AMPS] found connectors but now : cable ? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Tue, 29 Jan 2002 09:08:34 +0200; Hi all, This topic was covered before, but we allways will find more to say about this. I was servicing TV rcvrs for few years. Sometimes I found RG58 and RG59 coaxial cables used for the FB transfor; /archives//html/Amps/2002-01/msg00246.html (10,640 bytes)
20. [AMPS] found connectors but now : cable ? (score: 1): Author: yo9fzs@office.deck.ro (yo9fzs); Date: Thu, 31 Jan 2002 09:26:44 +0200; Hi Marv I'm absolutely sure. I remember that in a TV set made by Telefunken I saw for the first time a RG58 coaxial (labeled as RG58), until then I saw only "no name" ones... This arrangement was use; /archives//html/Amps/2002-01/msg00360.html (10,902 bytes)

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